CVE-2018-15369: Cisco IOS and IOS XE Software TACACS+ Client Denial of Service Vulnerability
First published: Fri Oct 05 2018(Updated: )
A vulnerability in the TACACS+ client subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability is due to improper handling of crafted TACACS+ response packets by the affected software. An attacker could exploit this vulnerability by injecting a crafted TACACS+ packet into an existing TACACS+ session between an affected device and a TACACS+ server or by impersonating a known, valid TACACS+ server and sending a crafted TACACS+ packet to an affected device when establishing a connection to the device. To exploit this vulnerability by using either method, the attacker must know the shared TACACS+ secret and the crafted packet must be sent in response to a TACACS+ request from a TACACS+ client. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS | =15.6\(1.9\)t | |
| Cisco IOS XE |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2018-15369?
CVE-2018-15369 is considered a high severity vulnerability due to its potential to cause a denial of service condition.
How do I fix CVE-2018-15369?
To fix CVE-2018-15369, it is recommended to update the Cisco IOS or Cisco IOS XE software to a version that addresses this vulnerability.
What impact does CVE-2018-15369 have on affected devices?
CVE-2018-15369 can cause affected devices to reload unexpectedly, leading to service interruptions.
Which Cisco IOS versions are affected by CVE-2018-15369?
CVE-2018-15369 affects Cisco IOS software version 15.6(1.9)t and certain versions of Cisco IOS XE.
Can CVE-2018-15369 be exploited remotely?
Yes, CVE-2018-15369 can be exploited by an unauthenticated remote attacker.
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